id summary reporter owner description type status milestone component version severity resolution keywords cc 5595 Windows: Cannot write to files which have been mapped to memory in other threads/processes Armin Pies Jonathan Turkanis "Windows: If I try to open a file for writing which has been memory mapped by using boost::iostreams::mapped_file_source, I get an ""Permission denied"". Under Linux (e.g. Ubuntu, openSUSE) there is no problem. The cause of this behavior seems to be, that mapped_file_impl::open_file uses CreateFile WIN32 API with the parameter FILE_SHARE_READ instead of FILE_SHARE_WRITE. Is this supposed to be like this? " Bugs new To Be Determined iostreams Boost 1.43.0 Problem memory mapping, windows